Improvement in telegraphic transmitting instruments



T. A. EDISON. TELEGRAPHIG TRANSMITTING INSTRUMENT. No. 114,656.

Patented Many 9, 1871.

lam/9. g JELOILA ttnittii sate THOMAS A. EDISON, or NEWARK, NEW JERSEY.

Letters Patent No. 114,656,dated May" 9, 1871.

IMPROVEMENT IN TELEGRAPHIC TRANSMITTING INSTRUMENTS.

The Schedule referred to in than Letters Patent and making part of thename.

' employed to make and break the electrical circuit in transmitting themessage.

In transmitting instruments adapted to said paper there is a small diskor wire brush that closes the metallic circuit through the perforations,and the circuit is broken by the paper when the unperforated portionintervenes between the roller or plate and the disk or wire brush.

The transmission of pulsations of electricity being very rapid in thissystem of telegraphing, there is a difliculty that sometimes arises fromthe wire not clearing itself, and the pulsations are attenuated and donot distinctly reach the distant station.

My invention consists in arranging the connections and portions of theinstrument in such a manner that a reverse current shall be thrown uponthe wire of the circuit by a. motion delived from the thickness of thepaper when the same is drawn in between the plate or roller and thebrush or disk.

In the drawing the device in question is represented by a side view.

Let 0 represent a plate, roller, or metallic surface,

over which the strip of perforated paper 8 is drawn,

The battery is represented at c, and the groundwire at d, and theline-wire at f.

The current will therefore be sent, when the circuit is closed, throughthe perforation of the paper; and when the unperiorated portion of thepaper is beneath the brush or stilns b the end is lifted suflicient- Iyto touch, or nearly so, the point 13, that is adjustable and mounted inany convenient manner.

By the said movement the battery kis broughtinto action .by closing thecircuit between i) and b, and a reverse current is thrown upon thetelegraph-line, thereby preventing the attenuation of the previouspulsation, clearing the wire, and causing the mark at thereceiving-station to be clear and distinct.

I claim as my invention- A circuit-closer operated by the movement ofthe perforated paper in a telegraph transmitting instrument to throw areverse circuit on the line, substantially as set forth.

Signed by me this 22d day of June, A. D. 1870.

THOMAS A. EDISON.

Witnesses:

CHAS. H. SMITH, Gno. T. PINGKNEY.

